Hamilton and Crowder Surnames

I am researching my fathers family history Charles William Crowder 1939-2001. His father was Laverne William Crowder (Hamilton)1912-1951. Leverne was born a Hamilton,, His parents I am told were Green Hamilton 1848-1914, and Sarah Belle Melton Hamilton 1878-1921. I was also told that these parents died when the boys were young and Levern being the youngest was sent to live with the Crowders. The date for Sarah doesn't match this story and I have ran into a brick wall . Does anyone have any information to help me over this wall?